Changeset 222e57c in mainline for uspace/lib/libc

Timestamp:

2008-01-06T19:39:13Z (18 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

41a0d27

Parents:

10d6b858

Message:

Add libc and VFS implementation of lseek(), VFS_SEEK resp.
Add the size member to the VFS node structure (not yet initialized).

Location:

uspace/lib/libc

Files:

• generic/vfs.c (modified) (2 diffs)
• include/unistd.h (modified) (1 diff)

uspace/lib/libc/generic/vfs.c

@@ -1 +1 @@
 /*
- * Copyright (c) 2007 Jakub Jermar 
+ * Copyright (c) 2008 Jakub Jermar 
  * All rights reserved.
  *
@@ -185 +185 @@
         return (ssize_t) IPC_GET_ARG1(answer);
 }
+
+off_t lseek(int fildes, off_t offset, int whence)
+{
+        int res;
+        ipcarg_t rc;
+
+        futex_down(&vfs_phone_futex);
+        async_serialize_start();
+        if (vfs_phone < 0) {
+                res = vfs_connect();
+                if (res < 0) {
+                        async_serialize_end();
+                        futex_up(&vfs_phone_futex);
+                        return res;
+                }
+        }
+                
+        off_t newoffs;
+        rc = async_req_3_1(vfs_phone, VFS_SEEK, fildes, offset, whence,
+            &newoffs);
+
+        async_serialize_end();
+        futex_up(&vfs_phone_futex);
+
+        if (rc != EOK)
+                return (off_t) -1;
+        
+        return newoffs;
+}
+
 /** @}
  */

uspace/lib/libc/include/unistd.h

@@ -42 +42 @@
 #define getpagesize()     (PAGE_SIZE)
 
+#define SEEK_SET        0
+#define SEEK_CUR        1
+#define SEEK_END        2
+
 extern ssize_t write(int fd, const void * buf, size_t count);
 extern ssize_t read(int fd, void * buf, size_t count);
+extern off_t lseek(int, off_t, int);
+
 extern void _exit(int status);
 extern void *sbrk(ssize_t incr);